I suppose it really just depends on what type of lip color you're going for. Lip gloss is back and in full affect so if you really want lip color I'd go with something like that. It gives you color AND shine. I mean I'm 20 and love make up but I hardly ever wear lipstick. Honestly, if you're 12-15 you don't want anything too heavy anyway. Being light and natural is always the key.
I love Bourjois 3D Effect glosses as well as Dior Addict and Guerlain's glosses. Oddly enough I've become addicted to Bath & Body's glosses as well because they have nice color and taste good (very kissable stuff, lol)